Cellular phones use radio waves to transmit voice communication in the . . . . . . band.

Which rays are not a portion of the electromagnetic spectrum?

Which of the following represents the wavelength range of infrared rays?

Arrange the following in the ascending order of wavelength :
$(A)$ Gamma rays $(\lambda_1)$
$(B)$ $X$-rays $(\lambda_2)$
$(C)$ Infrared waves $(\lambda_3)$
$(D)$ Microwaves $(\lambda_4)$
Choose the most appropriate answer from the options given below :

Infrared rays can be detected by .......

For television broadcasting,the frequency employed is normally